As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 9003 FWA-DAY, PILOT CALLED ON THE RADIO REPORTING THE CAPTAIN'S ALTIMETER AND VERTICAL SPEED INDICATOR WERE FLUCTUATING 20-40 FT, CAUSING THE AUTO-PILOT TO FOLLOW WITH A PITCH UP AND DOWN FLUCTUATION. AIRCRAFT WAS TOLD TO RETURN TO FWA. AIR DATA COMPUTER WAS REPLACED.